Polyethylene tarping elevates temperature and reduces emergence of Phloeosinus punctatus LeConte (Coleoptera: Curculionidae) from giant sequoia debris piles
Data files
Oct 21, 2025 version files 6.34 KB
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data_summary_glm.1.csv
3.50 KB
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data_summary_tarping.csv
527 B
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README.md
2.31 KB
Abstract
This study evaluated tarping treatments for managing P. punctatus populations in recently fallen branches in giant sequoia forests. A field experiment tested beetle emergence from debris piles relative to tarping treatments (covered or uncovered by a 4 mm clear polyethylene tarp) using a paired design, and the effects of several environmental factors on emergence were modeled. Tarping treatment resulted in a 53% reduction in mean beetle emergence; standardized beetle emergence was 9.8 ± 2.6 beetles/kg in the treatment group, 19.2 ± 5.6 beetles/kg in the control group, and an average of 14.5 for the study. Mean temperatures were 21.8°C in tarped piles, compared to 19.7°C in control piles, indicating that tarping altered the thermal environment to impact emergence. No emergence occurred when the mean ambient temperature exceeded 24°C.
Dataset DOI: 10.5061/dryad.2jm63xszn
Description of the data and file structure
These data were collected from an experiment that measured bark beetle emergence from wood debris piles (giant sequoia in California) that were either covered with a clear polyethylene tarp or left undisturbed (controls). The experiment used a paired design. Temperature loggers were placed in each pile to measure ambient mean and maximum temperatures. Other attributes were also measured for each pile, including canopy structure and distance to the nearest host tree.
Files and variables
File: data_summary_glm.1.csv
Description: A summary of all primary project data used in the construction of linear models.
Variables
- site: The site number.
- Treatment: The treatment (tarped or control).
- rep: Replicate number in paired test.
- pilemass: Mass of debris pile, kg.
- totalbeetleemergence: Total number of emerged beetles per pile.
- canopyopenness: Canopy openness, as a fraction (0-1).
- tmax: Maximum ambient temperature, degrees C.
- tmean: Mean ambient temperature, degrees C.
- elevation: Elevation above sea level of pile location, m.
- beetlekg: Beetle emergence standardized to mass of branch piles, beetles/kg.
- metersfrom: Distance of pile to nearest host tree (giant sequoia), m.
For cells with a value of 'n/a', data loggers had malfunctioned, and readings were not retained.
File: data_summary_tarping.csv
Description:
Variables
- site: The site number.
- rep: Replicate number in paired test.
- control: Standardized beetle emergence (beetles/kg), control piles.
- tarped: Standardized beetle emergence (beetles/kg), tarped piles.
- t_diff: The difference in standardized beetle emergence between two piles in a paired replicate (control - tarped).
Code/software
Files can be viewed in any software that supports .csv. Data were statistically analyzed in the R programming environment.
Access information
Other publicly accessible locations of the data:
- NA
Data was derived from the following sources:
- NA